While on liberty in Baltimore, Maryland, two sailors of the US Navy find the body of a buddy, a boatswain's mate second-class, who died from a stab wound; the Baltimore PD soon finds a suspect, who is not only a mechanic at a nearby automotive shop but also a brother-in-law of Vance, the director of the NCIS; Gibbs and company investigate. McGee learns that a second sailor failed to return from liberty; Tony and Ziva meet another shipmate; Ducky says that the victim took part in a fight several hours before he died; Tony and Ziva meet also a girlfriend and yet another shipmate. McGee finds a lie, Gibbs pursues it, and Vance and Gibbs have a chat; Vance's wife shows much anger, but she gets over it. Abby produces good stuff, McGee gets a good tip, then Gibbs, Tony, and Ziva make a good bust. Abby solves the case, then Vance gets a confession, and Gibbs and Tony take the bad guy into custody. Vance learns how to play a game.